1. Wind Tunnel Specifications • 50kW synchronous AC motor, centrifugal fan • Vertical diffuser, area ratio 2.87 • Horizontal diffuser, area ratio 2.65 • Settling chamber 2650 x 2150 x 2500mm length • Contraction, area ratio 11.4 • Working section, 1000x500mm outlet, open sided • Four plastic screens (open area ratio 0.65) fixed in the fan adaptor and diffuser sections • Aluminium Honeycomb in the settling chamber, 50.8mm thickness, 6.3mm cell size

2. Flow Uniformity • Flow velocity contours at tunnel outlet without working section 5 m/s 10 m/s 15 m/s

3. Flow Uniformity • Flow velocity is within 1% of mean velocity across the 1m x 0.5m working section outlet Velocity contours in working section 5 m/s 10 m/s

4. A B 200mm Horizontal Wind Gradient • Mean pressures A & B measured simultaneously with two pitot-static tubes spanning 200mm at the anemometer cup location. Procedure repeated with p-s tubes reversed. • Linear regression shows 0.3% difference in pressure

5. Turbulence Measurements single normal hotwire Pitot-static tube (design similar to AMCA type) anemometer & filter (5kHz) Pressure Transducer Ashcroft XLdp Analog-Digital Converter NI PCI-6013 (16 bit) PC

6. Turbulence Intensity Turbulence Intensity

7. Wind Tunnel Turbulence Spectra

8. p-s probe location Cup Anemometer Calibration Setup

9. Calibration Procedure Pitot-static tube (design similar to AMCA type) • Risoe P2546A cup anemometer calibrated using the Measnet procedure • No blockage included for Newcastle result Pressure Transducer Ashcroft XLdp HP Frequency Counter Analog-Digital Converter NI PCI-6013 (16 bit) PC